Valve oil seal burning oil how to judge, the replacement of valve oil seal is considered overhaul
Valve oil seal is an important part of the engine, its main role is to prevent the mixture of gasoline and air and exhaust gas leakage, and prevent engine oil from entering the combustion chamber. When there is a problem with the valve oil seal, it usually leads to the phenomenon of engine oil burning, so how to judge the valve oil seal oil burning, the following can be seen.
For the in-cylinder direct injection self-priming engine, if the intake manifold is removed, it can be found that there are black colloidal substances gathered above the valve, then it can be determined that the valve oil seal leaks oil, and the mixture of oil and impurities resulting in the formation of these black colloidal substances in a long-term high temperature state.
The valve seal can also be determined by the way of refueling and loosening the throttle. When filling the door, the exhaust pipe emits blue smoke, which is why the piston, piston ring and cylinder liner wear gap is too large. When the throttle is lifted, the exhaust pipe emits blue smoke, which is the cause of valve oil seal damage and valve duct wear.
The usual effect of a faulty valve seal is that the engine burns oil and emits blue smoke as it exhausts. Long time has not been processed, it is easy to make the valve and spark plug carbon accumulation serious, combustion is not enough, resulting in the power of the car engine decline.
Does replacing the valve seal count as an overhaul
Engine overhaul is to disintegrate the engine. If the valve oil seal is replaced by cylinder disassembly technology, it does not belong to the overhaul. If the engine cylinder head is also removed, and then the replacement of the valve oil seal, it is an overhaul.
